-
附录：外文参考文献
PLC technique discussion and future development
From:Electronic Test Equipment-principles and Applications.
Princeton University. America
Along
with
the
development
of
the
ages,
the
technique
that
is
nowadays
is also gradually perfect, the competition plays more more strong; the
operation that list depends the artificial has already can't satisfied
with
the
current
manufacturing
industry
foreground,
also
can't
guarantee
the
request
of
the
higher
quantity
and
high
new
the
image
of
the
technique
business enterprise.
The people see in produce practice, automate brought the tremendous
convenience and the product quantities for people up of assurance, also
eased the personnel's labor strength, reduce the establishment on the
personnel.
The
target
control
of
the
hard
realization
in
many
complicated
production lines, whole and excellent
turn, the best decision etc.,
well-trained
operation
work,
technical
personnel
or
expert,
governor
but
can judge and operate easily, can acquire the satisfied result. The
research
target
of
the
artificial
intelligence
makes
use
of
the
calculator
exactly to carry out, imitate these intelligences behavior, moderating
the work through person's brain and calculators, with the mode that
person's
machine
combine,
for
resolve
the
very
complicated
problem
to
look
for the best path
We
come
in
sight
of
the
control
that
links
after
the
electric
appliances
in
various
situation,
that
is
already
the
that
time
generation
past,
now
of
after
use
in
the
mold
a
perhaps
simple
equipments
of
grass-roots
control
that
the
electric
appliances
can
do
for
the
low
level
only;And
the
PLC
emergence
also
became
the
epoch-making
topic,
adding
the
vivid software control through a very and stable hardware, making the
automation head for the new high tide.
The PLC biggest characteristics lie in: The electrical engineering
teacher already no longer electric hardware up too many calculationses
of cost, as long as order the importation that the button switch or the
importation of the sensors order to link the PLC up can solve problem,
pass to output to order the conjunction contact machine or control the
start
equipments
of
the
big
power
after
the
electric
appliances,
but
the
exportation equipments direct conjunction of the small power can.
PLC internal containment have the CPU of the CPU, and take to have
an I/ O for expand of exterior to connect a people's address and saving
machine three big pieces to constitute, CPU core is from an or many is
tired to add the machine to constitute, mathematics that they have the
logic
operation
ability,
and
can
read
the
procedure
save
the
contents
of
the machine to drive the homologous saving machine and I/ Os to connect
after pass the calculation; The I/ O add inner part is tired the input
and
output
system
of
the
machine
and
exterior
link,
and
deposit
the
related
data
into
the
procedure
saving
machine
or
data
saving
machine;
The
saving
machine can deposit the data that the I/ O input in the saving machine,
and in work adjusting to become tired to add the machine and I/ Os to
connect, saving machine separately saving machine RAM of the procedure
saving machine ROM and datas, the ROM can can do deposit of the data
permanence in the saving machine, but RAM only for the CPU computes the
temporary calculation usage of hour of buffer space.
The PLC anti- interference is very and excellent, our root need not
concern its service life and the work situation bad, these all problems
have already no longer become the topic that we fail, but stay to our is
a
concern
to
come
to
internal
resources
of
make
use
of
the
PLC
to
strengthen
the control ability of the equipments for us, make our equipments more
gentle.
PLC
language
is
not
we
imagine
of
edit
collected
materials
the
language or language of Cs to carry on weaving the distance, but the
trapezoid
diagram
that
the
adoption
is
original
after
the
electric
appliances to control, make the electrical engineering teacher while
weaving to write the procedure very easy comprehended the PLC language,
and a lot of non-
electricity professional also very quickly know and
go
deep into to the PLC.
Is
PLC
one
of
the
advantage
above
and
only,
this
is
also
one
part
that
the
people
comprehend
more
and
easily,
in
a
lot
of
equipmentses,
the
people
have
already
no
longer
hoped
to
see
too
many
control
buttons,
they
damage
not only and easily and produce the artificial error easiest, small is
not a main error perhaps you can still accept; But lead even is a fatal
error greatly is what we can't is tolerant of. New technique always for
bringing more safe and convenient operation for us, make we a lot of
problems
for
face
on
sweep
but
light,
do
you
understand
the
HMI?
Says
the
HMI
here
you
basically
not
clear
what
it
is,
also
have
no
interest
understanding,
change
one
inside
text
explains
it
into
the
touch
to
hold
or
man-machine
interface
you
knew,
it
combines
with
the
PLC
to
our
larger
space.
HMI the control not only only is reduced the control press button,
increase the vivid of the control, more main of it is can sequence of,
and
at
can
the
change
data
input
to
output
the
feedback
with
data,
control
in the temperature curve of imitate but also can keep the manifestation
of view to come out. And can write the function help procedure through
a plait to provide the help of various what lies in one's power, the one
who make operate reduces the otiose error. Currently the HMI factory is
also more and more, the function is also more and more strong, the price
is
also
more
and
more
low,
the
noodles
of
the
usage
are
wide
more
and
more.
The HMI foreground can say that th
ink ° to be good very.
At a lot of situations, the list is is a smooth movement that can't
guarantee the equipments by the control of the single machine, but pass
the
information
exchanges
of
the
equipments
and
equipments
to
attain
the
result that we want. For example fore pack and the examination of the
empress work preface, we will arrive wrapping information feedback to
examine the place, and
examine the information
of the place
to also want
the
feedback
to
packing.
Pass
the
information
share
thus
to
make
both
the
chain connect, becoming a total body, the match of your that thus make
is more close, at each other attain to reflect the result that mutually
flick.
The
PLC
correspondence
has
already
come
more
more
body
now
its
value,
at the PLC and correspondence between PLCs, can pass the communication
of the information and the share of the datas to guarantee that of the
equipments moderates mutually, the result that arrive already to repair
with each other. Data conversion the adoption RS232 between PLC connect
to come to the transmission data, but the RS232 pick up a people and can
guarantee 10 meters only of deliver the distance, if in the distance of
1000 meters we can pass the RS485 to carry on the correspondence, the
longer distance can pass the MODEL only to carry on deliver.
The
PLC
data
transmission
is
just
to
be
called
a
form
to
it
in
a
piece
of and continuous address that the data of the inner part delivers the
other party, we, the PLC of the other party passes to read data in the
watch to carry on the operation. If the data that data in the watch is
a
to
establish
generally,
that
is
just
the
general
data
transmission,
for
example today of oil price rise, I want to deliver the price of the oil
price to lose the oil ally on board, that is the share of the data; But
take
data
in
the
watch
for
an
instruction
procedure
that
controls
the
PLC,
that had the difficulty very much, for example you have to control one
pedestal robot to press the action work that you imagine, you will draw
up for it the form that a procedure combine with the data sends out to
pass by.
The form that information transport contain single work, the half a
work
and
the
difference
of
a
workses
.The
meaning
of
the
single
work
also
is to say both, a can send out only, but a can receive only, for example
a
spy
he
can
receive
the
designation
of
the
superior
only,
but
can't
give
the
superior
reply;
A
work
of
half
is
also
2
and
can
can
send
out
similar
to accept the data, but can't send out and accept at the same time, for
example
when
you
make
a
phone
call
is
to
can't
answer
the
phone,
the
other
party
also;
But
whole
pair
works
is
both
can
send
out
and
accept
the
data,
and can send out and accept at the same time. Be like the Internet is a
typical example.
The
process
that
information
transport
also
has
synchronous
and
different step cent: The data line and the clock lines are synchronous
when synchronous meaning lie in sending out the data, is also the data
signal and the clock signals to
be
carry on
by
the CPU to
send out at
the
same
time,
this
needs
to
all
want
the
specialized
clock
signal
each
other
to
carry
on
the
transmission
and
connect
to
send,
and
is
constrained,
the
characteristics
of this
kind
of method
lies in its speed very quick, but
correspond
work
time
of
take
up
the
CPU
and
also
want
to
be
long
oppositely,
at
the
same
time
the
technique
difficulty
also
very
big.
Its
request
lies
in
can'ting
have
an
error
margins
in
a
datas
deliver,
otherwise
the
whole
piece according to compare the occurrence mistake, this on the hardware
is
a
bigger
difficulty.
Applied
more
and
more
extensive
in
some
appropriative
equipmentses,
be
like
the
appropriative
medical
treatment
equipments, the numerical signal equipments...etc., in compare the one
data deliver, its result is very good.
And the different step is an application the most extensive, this
receive benefit in it
of technique difficulty
is opposite and
want to be
small,
at
the
same
time
not
need
to
prepare
the
specialized
clock
signal,
its
characteristics
to
lie
in,
its
data
is
partition,
the
long- lost
send
out and accept, be the CPU is too busy of time can grind to a stop sex
to work, also reduced the difficulty on the hardware, the data throw to
lose
at
the
same
time
opposite
want
to
be
little,
we
can
pass
the
examination of the data to observe whether the data that we send out has
the
mistake
or
not,
be
like
strange
accidentally
the
method,
tired
addition and eight efficacies method etc., can use to helps whether the
data
that
we
examine
to
send
out
have
or
not
the
mistake
occurrence,
pass
the feedback to carry on the discriminator.
A line of transmission of the information contain a string of and
combine the cent of: The usual PLC is 8 machines, certainly also having
16 machines. We can be an at the time of sending out the data a send out
to the other party, also can be 88 send out the data to the other party,
an and 8 differentiationses are also the as that we say to send out the
data and combine sends out the data. A speed is more and slowly, but as
long
as
2
or
three
lines
can
solve
problem,
and
can
use
the
telephone
line
to
carry
on
the
long range
control.
But
combine
the
oscular
transmission
speed is very quick of, it is a string of oscular of 25600%, occupy the
advantage in the short
distance, the in
view of the
fact TTL electricity
is even, being limited by the scope of one meter generally, it combine
unwell used for the data transmission of the long pull, thus the cost is
too expensive.
Under
a
lot
of
circumstances
we
are
total
to
like
to
adopt
the
string
to combine the conversion chip to carry on deliver, under this kind of
circumstance
not
need
us
to
carry
on
to
depositted
the
machine
to
establish
too and complicatedly, but carry on the data exchanges through the data
transmission instruction directly, but is not a very viable way in the
correspondence,
because
the
PLC
of
the
other
party
must
has
been
wait
for
your data exportation at the time of sending out the data, it can't do
other works.
When you are reading the book, you hear someone knock on door, you
stop to start up of affair, open the door and combine to continue with
the one who knock on door a dialogue, the telephone of this time rang,
you signal hint to connect a telephone, after connecting the telephone
through,
return
overdo
come
together
knock
on
door
to
have
a
conversation,
after dialogue complete, you continue again to see your book, this kind
of
circumstance
we
are
called
the
interruption
to
it,
it
has
the
authority,
also having sex of have the initiative, the PLC had such function .Its
characteristics
lie
in
us
and
may
meet
the
urgently
abrupt
affairs
in
the
operation
process
of
the
equipments,
we
want
to
stop
to
start
immediately
up
of
work,
the
whereabouts
manages
the
more
important
affair, this
kind
of
circumstance
is
we
usually
meet
of,
PLC
while
carry
out
urgent
mission,
total
will
keep
the
current
appearance
first,
for
example
the address
of
the
procedure,
CPU
of
tired
add
the
machine
data
etc.,
be
like
to
to
stick
down
which
the
book
that
we
see
is
when
we
open
the
door
the
page
or
simply
make
a
mark,
because
we
treat
and
would
still
need
to
continue
immediately
after book of see the behind. The CPU always does the affair that should
do according to our will, but your mistake of give it an affair, it also
would be same to do, this we must notice.
The interruption is not only a, sometimes existing jointly with the
hour several inside break, break off to have the preferred Class, they
will
carry
out
the
interruption
of
the
higher
Class
according
to
person's
request. This kind of breaks off the medium interruption to also became
to break off the set. The Class that certainly break off is relevant
according to various resources of CPU with internal PLC, also following
a heap of capacity size of also relevant fasten.
The contents that break off has a lot of kinds, for example the
exterior
break
off,
correspondence
in
of
send
out
and
accept
the
interruption and settle and the clock that count break off, still have
the WDT to reset
the interruption
etc., they
enriched the CPU to respond
to the category while handle various business. Speak thus perhaps you
can't comprehend the internal structure and operation orders of the
interruption completely also, we do a very small example to explain.
Each
equipments
always
will
not
forget
a
button,
it
also
is
at
we
meet
the urgent circumstance use of, that is nasty to stop the button. When
we meet the Human
body trouble
and
surprised circumstances we
as long as
press it, the machine stops all operations immediately, and wait for
processing the over surprised empress recover the operation
stop the internal I/ O of the internal CPU of the button conjunction PLC
to connect up, be to press button an exterior to trigger signal for CPU,
the
CPU
carries
on
to
the
I/
O
to
examine again,
being
to
confirm
to
have
the exterior to trigger the signal, CPU protection the spot breaks off
procedure
counts
the
machine
turn
the
homologous
exterior
I/
O
-
-
-
-
-
-
-
-
本文更新与2021-01-24 22:39，由作者提供，不代表本网站立场，转载请注明出处：https://www.bjmy2z.cn/gaokao/562789.html